model.param.define {RGeostats}R Documentation

Specification of the Model Parameter

Description

Specification of the Model Parameters

Usage

model.param.define(rank.model, nostat = NULL)

Arguments

rank.model

Rank of the slot to which the model has been assigned

nostat

Array of keywords which define the set of Non-stationary parameters. Each keyword follows the following syntax:

G'igrf'M'istr”type”v1'[-'v2']='value'

Example: "G1M2V2-3" for the Sill of the cross-variogram between Variables #2 and #3, for the Structure #2 of the Random Function #1.

  • The string "G" stands for the designation of the Random Function.

  • 'igrf' stands for the rank of the Random Function. Defaulted to 1.

  • The string "M" stands for the designation of the Structure.

  • 'istr' stands for the rank of the Structure. Defaulted to 1.

  • 'type' designates the type of non-stationarity parameter according the following possibilities:

    • R for Range

    • A for Anisotropy angle

    • P for the auxiliary Parameter

    • V for the sill

    This 'keyword' is compulsory.

  • v1,v2 designate additional rank(s) for the Non-stationary parameter:

    • For Range: 'v1' stands for the space dimension. Defaulted to 1.

    • For Anisotropy Angle: 'v1' stands for the space dimension. Defaulted to 1.

    • For auxiliary Parameter: 'v1' and 'v2' are ignored.

    • For sill: In the monovariate case, only 'v1' should not be specified ('v2' is ignored). In the multivariate case 'v1'-'v2' gives the rank of the two variables of interest. Defaulted to '1-1'.

  • '=' Compulsory symbol if a numerical value is assigned to the specified parameter.

  • 'value' Value assigned to the specified parameter. Defaulted to NA. This feature is only required when specifying initial values of bounds used during the Automatic Structure recognition (See details).

All elements 'igrf', 'istr', 'v1' and 'v2' start from 1. The order in which the keywords are defined is important: it provides the order in which the corresponding Non-stationary locators are read. Finally all the characters involved in this grammar are case-insensitive

Details

An array of such keywords can be specified for particular usage:


[Package RGeostats version 11.0.6 Index]